Question: Context: Databases ** Consider the relations schemas R(A, B), S(A, B), and T(A,B). Suppose {A} is the key of all these relations. If U =

Context: Databases ** Consider the relations schemas R(A, B), S(A, B), and Context: Databases

** Consider the relations schemas R(A, B), S(A, B), and T(A,B). Suppose {A} is the key of all these relations. If U = RUSUT, that is U is the set union of these relations, then what is/are the key(s) of U? O {A} {B} {A, B} {A} and {B}

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